Collapse the SkTextInterceptsIter into base class

Reorganize the glyph Intercepts code to allow bulk operation.
This is just reorganizing and inlining existing code.

+ Shorten some long lines.

Change-Id: I1a01b50d94386279d3a8715a78266ee8a27547b5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/216606
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed